Malicious PDF — malware analysis report

Static analysis result for SHA-256 731a0a6e377f41bc…

MALICIOUS

PDF

87.7 KB Created: 2021-05-19 22:49:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 310a641014ae6a44763f73a6bfd4475a SHA-1: da33a6f8dd01a5bacd21bd2366324a90508648d4 SHA-256: 731a0a6e377f41bc25d63d5ce3e173ebc5b76c6140b42ee8233f6b49fbb18c8b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=valores+normales+del+bicarbonato+en+gasometria PDF link annotation
    • https://tilawebaxipas.weebly.com/uploads/1/3/4/5/134576196/xizadeboba.pdfIn PDF document text
    • https://famosufed.weebly.com/uploads/1/3/4/9/134900490/wumezeg_xanelopez.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453889/normal_5fc6a48eca750.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489041/normal_606e6e3a12f5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485589/normal_60410b091e674.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415309/normal_5fdabd4f5a38a.pdfIn PDF document text
    • https://depujoseteg.weebly.com/uploads/1/3/5/3/135309287/pimolaweni.pdfIn PDF document text
    • https://pivamaxisogen.weebly.com/uploads/1/3/4/4/134481881/3229fe1a822.pdfIn PDF document text
    • https://xebanodax.weebly.com/uploads/1/3/5/3/135382800/1b52437cc12e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383308/normal_600fa08283885.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478946/normal_60209b0a655f0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/443e2be7-99f3-4d86-b39b-a4d7077936a2/english_sayings_with_hindi_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/nimuwet/geographic_information_system_course_outline.pdfIn PDF document text
    • https://s3.amazonaws.com/levovod/sapejege.pdfIn PDF document text
    • https://s3.amazonaws.com/nunakixuma/how_to_fill_out_blank_check.pdfIn PDF document text
    • https://s3.amazonaws.com/gofiguj/pabovukawolizome.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c7429589-af90-40f8-8dea-ac66876f1d69/how_to_replace_lid_switch_on_whirlpool_washer.pdfIn PDF document text
    • https://s3.amazonaws.com/tiniruru/27695150173.pdfIn PDF document text
    • https://s3.amazonaws.com/teximikamukubo/nezusuxaguf.pdfIn PDF document text
    • https://s3.amazonaws.com/wixanarer/a_christmas_carol_patrick_stewart_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/lovomijelun/rca_rc205_dual_alarm_clock_radio.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f1b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B0 5152 bytes
SHA-256: a7342cc8e0366b23e9b5d59d6d0d462c1fe6be389522186f99f2c95df2e67250
font_01_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 12236 bytes
SHA-256: af9ba909bcee64f28b7f3c3786044c3416dfcab5ccca05e5e60f190695dc0dcb
font_02_sfnt_off00012abc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ABC 16296 bytes
SHA-256: cf9ce11ee76b36ccec7e8971a715ca187e8a6cc961a7965eb38d4e306fec58e6
font_03_sfnt_off0001405a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1405A 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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